SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 119 (ENGINE CONTROLS SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0101: MASS AIRFLOW SENSOR PERFORMANCEDIAGNOSTIC PROCEDURES
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Diagnostic Procedures

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Attempt to start the engine. Does the engine start? If yes, go to next step. If no, go to step  5.
  3. Monitor the Diagnostic Trouble Code (DTC) Information with the scan tool. Does the scan tool display any other DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
    5. NOTE: The Altitude vs. Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or temperature may cause a reading to be slightly out of range.
  5. Turn ignition ON, with engine OFF. Observe MAP sensor kPa parameter with a scan tool. MAP sensor pressure should be within the specified range for your altitude. See Figure. Is MAP sensor pressure within the specified range? If yes, go to next step. If no, go to DTC P0106: MAP SYSTEM PERFORMANCE .
  6. Start the engine and turn off all accessories. Allow the engine to reach operating temperature. Observe MAP sensor voltage with a scan tool. Is MAP sensor voltage 0.8-3.0 V? If yes, go to next step. If no, see DTC P0106: MAP SYSTEM PERFORMANCE .
  7. Idle the engine. Observe the MAP sensor parameter with a scan tool. Increase engine speed slowly to 3000 RPM and then back to idle. Does the MAP sensor parameter change smoothly and gradually through the specified range of the test? If yes, go to next step. If no, see DTC P0106: MAP SYSTEM PERFORMANCE .
  8. Turn ignition OFF for 30 seconds. Turn ignition ON, with engine OFF. Observe TP indicated angle parameter with a scan tool. Depress the accelerator pedal completely. Is TP indicated angle 95-100 percent? If yes, go to next step. If no, see DTC P1120: THROTTLE POSITION SENSOR 1 VOLTAGE OUT OF RANGE .
  9. Turn ignition OFF and inspect for the following conditions:
    • A restricted or collapsed air intake duct.
    • A misaligned air intake duct.
    • A dirty or deteriorating air filter element.
    • Any objects blocking the air inlet screen of the MAF sensor.
    • Any contamination or debris on the sensing elements of the MAF sensor.
    • Any water intrusion in the induction system.
    • Any water intrusion in the AIR system.
    • Any vacuum leak downstream of the MAF sensor.
    • A skewed or stuck ECT sensor.
    • A restricted exhaust system.

    Did you find and correct the condition? If yes, go to step  14. If no, go to next step.

  10. Turn ignition ON, with engine OFF. Disconnect MAF sensor harness connector. Test the voltage between ignition 1 voltage circuit of the MAF sensor and a good ground. Is voltage less than battery voltage? If yes, go to step  12. If no, go to next step.
  11. Test for an intermittent and/or poor connections at the MAF sensor. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  12. Repair the high resistance in the MAF sensor ignition 1 voltage circuit. Did you complete the repair? If yes, go to step  14.
  13. Replace MAF sensor. See MASS AIRFLOW SENSOR under SENSORS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  14. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  15. Observe the Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.